Phil on Wire - S3-E3
Continuity mistake: In 1-20 "Benched", Phil specifically states he knows how to walk a tightrope because he went to trapeze camp. But in this episode, he learns how to walk a tightrope.
Continuity mistake: Mitchell places his glass trophy on the left side of the mantel. The award moves to the center of the mantel just a few seconds later.
Aunt Mommy - S3-E15
Continuity mistake: When Claire is talking to Phil about having Cam's baby, she grabs a coffee cup out of the cabinet. In the next shot she grabs the same cup out of the cabinet again. (00:13:10)
Continuity mistake: In the scene when Cameron and Mitchell are arguing about Cameron's clowning career, Cameron is unpacking soft toys from a large paper bag. Cameron unpacks a hot dog soft toy twice from the bag, when the camera cuts from Cameron to Mitchell and back to Cameron. (00:13:00)
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