Disneyland - S3-E22
Revealing mistake: The episode was filmed with real Disneyland visitors. One can constantly see them staring at the camera and/or Disneyland cast members standing with their backs to the actors, monitoring the crowd. This is especially noticeable when the family first arrives and when Mitchell and Cameron talk about Lily's leash: behind the actors, there are long white rope lines supervised by park staff to keep visitors at a distance. Several people can be seen filming the actors or taking pictures with their phones.
Dance Dance Revelation - S2-E10
Revealing mistake: When Lily hits Mitchell in the face, her 'arm' is covered by a pyjama-like material, but the next shot shows her wearing a sleeveless dress, showing her 'arm' was really a padded stick.
Revealing mistake: While Phil and Claire are racing each other to Manny's birthday dinner, each car goes around corners, but the steering wheels are never turned.
Revealing mistake: In the scene where Claire catches Alex and Skyler about to shave each other's hair, Claire grabs the shaver and waves it around, and the shaver gets caught in Skyler's hair. The color of the hair caught in the shaver (black) is different from Skyler's hair color (very dark brown). It is quite close, but still significantly different. (00:11:50)
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