When Bird's co-workers are attacking Lem when he comes out the bathroom, he's wearing boxers under his towel.
At the beginning of the scene for the Sunday dinner that Ahmad arranged, there is a pitcher of grape or purple Kool-Aid. When the meal starts, the glasses are filled with a red drink.
When Lem is sitting in the living room talking to Kenny at his house, you can see a light from the camera visible in the window behind them.