Character mistake: In the "Casey At The Bat" sequence, the narrator says "The score is 4 to 2 with but an inning left to play." However, the scoreboard shows that eight and a half innings have been played, and only a half-inning remains.
Character mistake: Gail reads right through Katie's poor excuse about crotcheting, and says she won't go to the ball "after what you pulled today with Guy." She did not do it (well she didn't do anything, but 'supposedly did') today, but yesterday. (00:31:00)
Character mistake: When the camera pans to the frame containing the picture of Lars with his departed mother, the caption says "In memory of our beloved mother Mirra Gunnarsdottir", with a plain O. On the cross, her name is Mirra Gunnarsdóttir. It's two different letters, and it'd be pretty strange to honor the memory of your mother printing a photo with her name in the wrong form. (00:01:10)