Great list, V! Thanks for taking the time to compile it. I have some to add and others to discuss:
In ME3, when talking with Liara the first time and asking about Glyph or when it enters the conversation, Shepard's head starts to follow it, and don't stop, even when only talking to Liara.
Dunno if it's a bug or so, but : In ME2, if you use your power and enter the Hammerhead before the power Cooldown is complete, the two semi-circles (that represent the Power Cooldown system) will appear on screen and stay there until you exit the vehicle.
And then there is this recent bug I've saw being discussed about Tali's Recruitment Mission, where there was a door that wouldn't open, didn't even have the Red "Locked" or the Green "Open" Symbols.
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Discussion:
Pointed out by SilJeff: Conrad Verner accusing Shepard of pointing a gun to his face if Paragon option was taken in ME1. - This would be wise to implement, but in ME3, there is even a dialogue that Verner "fixes" that mistake. So, if this bug is fixed, then ME3 Conversation with Conrad would have to be changed too.
Pointed out by Heimerdinger: Jericho Station, Strabo System, Eagle Nebula. The lab room with the laser experiment - watching the laser hit the final point will crash the game. Need to look away from the beam to avoid this. This was fixed in ME2 latest patch. I've also experienced it, but when I applied the patch, it works just as normal.
Pointed out by L. Han: Walking right next to walls or other objects can sometimes randomly lift you up and get you stuck. Ditto. Sometimes you don't even NEED to walk right to the wall...I was in that planet you needed to disable the Bloodpack Coms Relay and I was moving normal, but suddenly, Shepard levitated and I got stuck, forcing me to restart the mission.