Continuity mistake: In the scene before Jay hits Phil in the face with the plane, the remote control's antenna (the one he is using to fly the plane) switches between the 'forward' and 'up' positions. (00:10:50)
Continuity mistake: Claire takes some cookies out of the oven and puts them on a cooling rack. When Manny asks her what the matter is with Claire, she holds still while she's about to put down the second cookie in the top row. When the camera cuts to a different angle there are suddenly three cookies in the row already. (00:12:05)
Continuity mistake: In the scene where Claire and Manny are discussing how they are brother and sister, Claire is placing cookies on a cooling rack from top to bottom. When the shot changes they are now placed left to right.
Answer: Mitch is upset that his dad doesn't seem to support his getting married. When they talk about Jay's friends not coming to the wedding, Jay makes it seem like Mitch wouldn't want them to come anyways. Mitch sees it as it's actually that Jay doesn't want to invite his friends to his gay son's wedding because he's embarrassed and uncomfortable about having a gay son. Essentially Mitch sees it as if he was marrying a woman, Jay would be willing so spend money on the wedding, host it at the club, and invite all his friends to it.
Bishop73