Well...let's see...
Jacob - The Gift of Greatness: The Hugo Gernsback crashed on 2175 Aeia approximately eight years prior to the Battle of the Citadel. All of the survivors are using thermal-clip weaponry which was not developed until after the Battle of the Citadel.
Overlord - During the cutscene where David is shown being interfaced into the Overlord hive mind and the geth begin killing the project team inside of Atlas station, the geth are shown holding weapons. Earlier, the geth David was shown interacting with were restrained. Why were any geth in Atlas Station not restrained? Why were they armed? The fact that this event took place as shown is completely implausible. While an armed uprising in Prometheus Station (the geth ship) is plausible, it should not have been in Atlas Station without a completely and ludicrously incompetent effort of the project's team not to restrain the geth and prepare a fail safe to prevent the geth platforms from moving.
Tali: Treason - Similar to Overlord. Why did were any of the geth platforms on the Alarai not restrained? While it is conceivable that a series of networked geth could have hacked the Alarai itself, not having armed quarians prepared to immediately destroy any restrained geth once the hack was discovered is also implausible. The quarians, of all people, would not have relied on any security restraint that could be hacked and would not have had any weapons within range of those platforms. Similarly, why are the geth armed with geth weaponry? If the geth have been pieced together by equipment gathered over long periods of time, the chances of having enough fully functioning geth weaponry for the entire active geth platforms to use is unlikely.
Rannoch - Geth Dreadnought: A few things here -
- No reason exists for the dreadnought to contain haptic and holographic interfaces that any organic can interface with. The geth would use wireless communication and interfaces if a hardware platform was required to gather information from the ship's higher runtimes.
- No reason for the geth fighters to require a physical platform to pilot it. It would not have physical controls. All geth weaponry, including armatures and colossi, are piloted by geth runtimes inhabiting the hardware like any other geth platform. The geth "pilot" would software downloaded into the hardware. This bleeds into the Geth Fighter Squadron mission as well, where the cutscene shows the physical platform acting as a pilot collapsing when the server goes dark.
Rannoch: Geth Fighter Squadrons: A few things here -
- The clip of a historical geth picking up a weapon that looks like an M-98 Widow has a number of problems. Shepard refer to the weapon as being similar to the weapon Legion used to carry. However, the M-98 Widow was a research project for Legion: the rifle it was first seen using is a M-97 Viper. You can go the entirety of Mass Effect 2 without Legion touching an M-98 Widow.
- Having the M-98 Widow even being referenced in this scene is anachronistic: it would make the design of the weapon almost certainly quarian and also over four hundred years old. The fact that M-15 Vindicators are seen in the historical footage as well would date those weapons back four hundred years as well. This is problematic because if these were taken in the same context as quarians wearing enviro-suits on Rannoch during the Morning War, which is to say they are wearing suits because they are projected through the filter of Shepard's mind who has not seen quarians, then they would make sense as Shepard's mind projecting familiar weapon designs into the era of the Morning War. Why this specific weapon is considered to be factually represented in the footage when Legion has already prefaced the earliest footage by saying it is build around Shepard's perceptions is questionable at best.
- The fact that Legion is able to free any of the geth runtimes from the server is highly questionable. If the Reaper transmitter is capable of controlling the entire geth fleet currently around Rannoch and all individual geth platforms on Rannoch, why Legion or the Geth VI is able to "convince" any get to act against the Reaper signal is problematic.
Priority: Tuchanka: The movements of the relatively tiny krogan tomkahs are enough to attract Kalross, which follows them relentlessly. However, the 160 meter tall Reaper Destroyer which literally shakes the surface of the planet around it as it moves is completely ignored by Kalross until the maw hammers are used. If the movements of Reaper is not enough to attract Kalross unless the hammers are used, but the movements of the tomkahs are...well...that's inconceivable.
Collector Ship: It is possible, and in most cases, PROBABLE, that the Normandy's weapons, shields, and armor have all been upgraded by the time this mission takes place. It's also possible that all of the Normandy's other upgrades (med-bay, probes, fuel) have been completed by then. There's no functional difference between the Normandy at this point than the Normandy during the Suicide Mission. However, the cutscenes and Joker's communication treats this as though the Normandy is but seconds away from being destroyed when in truth, the Normandy would have had a significant tactical advantage when the Collector vessel was still powering up and the Normandy was out of range of its main gun. A few shots with the Thanix canon from the side or behind, and suddenly the entire story changes. I know this scene takes place as it does because the Normandy may not yet be upgraded, but it is incredibly jarring to have the exact same ship be treated as the terror of the galaxy one moment, and something to be brushed aside with the blast of new weaponry the next, when the Normandy was in the exact same state of readiness in both scenes.
I can continue, but that's enough for now.