Continuity mistake: When Barry gets stuck inside for the first time, he hangs onto the drapes. His arm is straight across, but in the shot behind him, his arm is now bent and raised and above his head.
Continuity mistake: When talking to Barry on the apartment roof for the first time, Vanessa is sitting in a chair in front of a pink-flowered tree. In the next shot, the tree disappears, only to reappear in the shot following it. (00:25:40)
Continuity mistake: When Barry lands on the windshield chasing the "Honey farms" truck and is climbing up in horror, the grasshopper that is dead is not where he's supposed to be; it's a little beetle. Then when the wipers turn on, the grasshopper is way down close to the wiper.
Continuity mistake: When the bees are testing the hurricane survival, the bee opens the parachute and lands on the ground. When Barry and Adam are walking past, you can see in the background that the parachute is gone.
Continuity mistake: When Barry is talking to Vanessa, Barry is standing in front of a chocolate bar. In different shots you can see him standing on the right side of the chocolate bar.
Continuity mistake: When Barry is talking to Vanessa, Barry is standing in front of some keys. In the next scene, the keys are gone. (00:24:20)
Continuity mistake: When Ken gets hurt by the table, he has a red spot on his left forehead. A moment later when he is in the restroom trying to kill Barry, the red spot has gone. (00:52:40 - 00:53:25)
Answer: You are referring to Mr. Montgomery. And the license plate on Montgomery's car says "ALI BUY" on it. As in buying an alibi.