Near the start, Dana throws a pillow at Nicole and it falls on the floor. A while later she chases Nicole around the room. After they stop we can no longer see the pillow on the floor.
When Zoey says "Oh my God, I can see the ocean from here!" The camera focuses on her room from an outside perspective. It is obvious that the room she is standing in is completely different from the room where the camera focused inside it. Note how the walls are no longer purple.
In this episode, Zoey keeps on getting locked out of the room, which is why from this episode on, she keeps a key on a necklace. But after this episode no one ever seems to use a key to unlock dorm rooms. They just open the door and walk in.
When Nicole used the silent leafblower, it was supposed to make the frizz go away. But when she got up and turned her head, the whole side of her head was frizzy and messy. Then after it switched from the view of Dana sleeping back to Nicole, the frizz was gone.
Dana claims that she sets her alarm clock for 7:55 every morning, but it is highly unlikely for her to get to class on time if she got up at five minutes before her class at 8:00. Also, in the episode, Jet X, Dana panics when she wakes up ten minutes before class.