Quick Question about ME2 Loyalty Missions

Tali stuff matters when trying to resolve the geth-quarian war. Or, rather, stuff from her ME2 loyalty mission factors in, as well as if she survives ME2. Same what who you do with Legion in ME2 (turn him over to Cerberus or just allow him to die on the suicide mission).

Lack of loyalty for the others doesn't seem to impact ME3 so long as they survived.

OK, thanks.

For Thane, if you fail the mission, he's a bit more aggressive when you chat to him in the hospital and doesn't mention getting any visits. Not much changes in the other conversations. My game glitched at his bedside, since Kolyat was there and they seemed to be good friends and later Shepard got to host a funeral, so I'm not sure how that works properly if you fail the mission.
But the passive aggressive thing was funny.
(Not sure if it that's the same as if you skip his mission).

If you fail Samara's loyalty mission, there isn't much difference in game, at least not in the mission you meet her in. But I think if you pick a non refuse ending, you get a bit cooler epilogue slide.