Throughout the movie, all of the characters mouths do not match the audio. It's apparent that all of the cuss words were taken out during voice dubbing in final production. For example, when Brady Francis finds out that Kevin's friends are taking the girls out, his voice says "his butt is mine" but his mouth clearly says "his ass is mine."
When Kevin is waiting to meet his "L Train Girl" at their place, the clock shows that it is a few minutes past 7 o'clock. When she finally shows up and they embrace for a kiss, the same clock now shows that it is 6:50.
When Kevin meets Abby and she begins to fold a paper airplane, she folds the paper in half horizontally. The plane she's holding in the immediate next scene could not have been created with horizontal fold to start its creation.