Plot hole: There's no way for Albert to show up at the front door as Val's mother the night the Keeleys are there, as the only way out of his bedroom (which he is still in by the time the Keeleys show up) is through the door that leads into the living room where the Keeleys, Val and Armand are.
Continuity mistake: In the scene in which Armand and Albert are at the outdoor cafe, Armand is attempting to teach Albert to act straight. In the shot where Albert is trying to walk like John Wayne, the lady is watching him. She then looks back to her paper. However, when the shot changes, she is still looking at Albert and turns to her paper again.
Continuity mistake: When Albert and Armand are in the kitchen and they are discussing Val's interest in getting married, if you look at the glasses on the kitchen island, they change positions between shots. One of the glasses is more towards the right side even though everyone has already got their hands full.