After Spencer puts his brown paper bags filled with butter in the refrigerator he leaves the refrigerator door ajar, but in the next shot, as he runs off to turn the toilet water blue, the refrigerator door is closed.
When showing the video of the crump dancer on iCarly, on Freddie's laptop the iCarly logo is seen in the bottom right-hand corner while on the studio monitor it is in the top right-hand corner.
When Spencer picks up his keys to drive Carly to Nevel's house and walks to the front door of their apartment to leave, he clearly has no butter stuck to his elbow, yet when they arrive at Nevel's house a dab of butter has appeared on his elbow, apparently out of nowhere. Later at Nevel's house, the butter disappears from his elbow.
When Carly and Sam do the iCarly Random Dancing, Sam pulls Chuck and makes him dance. The Chinese food is now on the floor. However, after the shot where Freddie holds the camera, the food is gone.
Freddy's mother said she saw Spencer carrying many containers of butter into his apartment, but the butter was in brown paper bags and she would not have known what was contained in the bags.