If you did not punch the reporter in the first game, but hit her in the second, Shepard will say he/she wanted to do it the first time they met, and she will curse him/her with the same words she uses in the first game.
Also, should you decide to explain your actions to her, your discourse is altered not only taking into account what you did regarding saving the Asari flagship, but also your origin.
The insane doctor manuel from eden prime is mentioned in the n7/overlord mission in me2 in which the base collapses and you must hurry to escape.
Only now I discovered that in ME1m just like in Dragon Age, you were supposed to be able to take control also of your squadmates. A shame this was scraped. It would have been nice to be able to manually fight as Wrex. Btw, the game in the demo looks so much better than the final version, specially in the way the enemies react and can die.
After some wins at pinnacle station, you can ask the admiral what he thinks about the turians.
Only recently I discovered there´s a bug in multiplayer, in the missions when you need to upload data. If you´re playing solo, turn the upload on and run away fast, and the upload will continue anyway.
There´s a bug involving husks in me1 and 2 that is very funny. Disable the final tendril on feros, while there are still husks in the area, or disable the core in the iff mission prior to killing the husks, and during the next cutscene they will still be there and attacking the characters.