In the restaurant where Claire is having dinner with Jay, she has Ben sending three texts to Jay. For the first two texts you can see Jay looking at a text window, but for the third text he's clearly looking at his phone's home screen.
A big part of the prom plot revolves around Cam never having been to his own prom, but in season 3, he tells the family that he drove and parallel parked a tractor at his high school prom.