When Ke$ha has posted the video of herself telling viewers that her competition is back on, the bar showing how long is left of the video moves backwards in each shot.
Andre explains how the competition works to his friends towards the start, saying that collecting a K, E, $ (pronounced as S), H or an A to win the private concert, when he really means that ALL letters need to be collected.
In the opening scene, Andre's ice cream has the white ingredient/calories list showing to his left, then without him touching it, the carton rotates and the ingredient/calories list is not seen.
Robbie is carrying a large pail (maybe 15-20 gallons) full of ice cream like it is empty. He is fairly weak and should be straining to carry something 75 - 100 pounds.
Robbie said in his profile video that he is lactose intolerant. However he is eating a lot of ice cream, which has lactose.