Continuity mistake: When Toula goes to meet Ian at the school where he works, and they are talking in the hallway, her arms occasionally move from behind his neck to the front of his shoulders. The continuity is correct at the bgeinning of the scene, but at the end it happens a few times.
Continuity mistake: When Ian asks Toula to marry him, before he does it, they are lying in bed talking. During the first shot, she is playing with his face with her left hand, and when the view changes to her, in the bottom left corner of the screen, you can see part of the same hand on her stomach. In the next shot of him, her hand is on his face again. This continues to switch throughout the scene.
Continuity mistake: When the next door neighbour brings back Toula's grandmother to her father, the camera angle from the front shows his right hand on her right arm near her shoulder. When the camera angle changes to a rear view, his hand is now on her shoulder. Happens twice during the scene.
Continuity mistake: In the scene where the family is discussing the wedding invitations, Ian and Nick are seated and there is a lemon on the table between them. When Toula says, "Ma, I never saw a wedding invitation," the lemon jumps onto the plate in front of Ian. In the next shot the lemon is back on the table again.