Arnie Pie is in the helicopter reporting on Marge blocking the bridge and accidentally drops his bagel to his right, so we can assume he is sat in the right hand side of the cockpit as we see the bagel fall out of the helicopter. A few shots later, we see the cockpit from a wider shot and Arnie is on the left and Kent Brockman has appeared between him and the right hand cockpit window. If he'd dropped his bagel, it would have just landed on the floor of the helicopter.
Maggie is seen crawling in some scenes, but this is simply a misconception about one-year-olds, and they actually never do crawl.
When Nick says, "Sorry, lady, you got the wrong Nick's.", his mouth is making an "o" shape instead.
When Marge stops short on the bridge and puts her car in park, she moves the gear shift in the wrong direction.