When Spencer is hauling the equipment cart down the stairs, watch the laptop on the cart as he's complaining. It is almost completely closed in one shot, and in the next one it's open at a much wider angle. This mistake happens several more times throughout the scene, especially at the end when they head back upstairs.
In the episode, iWill Date Freddie, Valery says she wants to do a webcast every Tuesday afternoon, and Freddie says that is the day they do iCarly. In iWant a World Record, they want to break the record for longest webcast for over 24 hours. If they do iCarly on a Tuesday and they were at school the day before when they brought in the book of world records, what ever happened to school? They would have to miss the whole school day on Wednesday.
However, it is possible that they did a special Friday or Saturday night webcast so they could break the world record.
However, it is possible that they did a special Friday or Saturday night webcast so they could break the world record.
When the maintenance guys show up to find the "gas leak" they enter through the door not the elevator, in order to do that they would have to go up the stairs in the apartment. However a few minutes later Spencer shows up asking what's happening. If they went up the stairs they would have had to pass by Spencer in the living room and told him what was going on.