When Jake is in the kitchen, talking to Alan about getting thrown off the school bus, the amount of orange juice in his glass keeps changing.
When Charlie is shown sleeping in Chelsea's bed, a passing car's headlights seem to bother Charlie since he is trying to get to sleep.
However most pictures of Chelsea's condo show her unit to be on the second floor so a passing car's headlights would probably not shine up into her bedroom and cause Charlie to not be able to fall asleep.
Chelsea is shown wearing all her makeup in bed. Most women remove their makeup before going to bed.