For the games that take place over a few days, I would like to see the male characters facial hair reflect the days passing. Leon is clean shaven. He should have some stubble by the end of 4, shouldn't he? I havn't played it in awhile but I think a few days go by in that game.
RE1 - started like in the evening then they escaped kinda like 6 or 7 in the morning RE2 - almost the same as RE1 RE3 - the first half of the game occurs 24 hours prior to Resident Evil 2 and the second half takes place two days after RE4 - leon arrived like either morning or afternoon then ashley and him escaped in the morning