Other mistake: When J is falling from the Chrysler building, the soles of his CGI shoes are completely black, brand new and spotless, which is impossible unless he got up there flying or changed his shoes in mid-air. (00:36:00)
Other mistake: J exits the Flatiron building and a woman in a yellow dress starts walking behind him. He looks at the street ahead and the same woman is walking from right to left. (00:38:35)
Other mistake: At the diner, J is given a strawberry rhubarb. For the first few seconds after being given his plate, he is never shown putting his fork in his food, yet he still chews anyway. (01:03:50)
Other mistake: When K wipes little James' memory at Cape Canaveral, he uses a small neuralyzer, but we've seen at the beginning that in 1969 the MiB only have the big tubes, and K doesn't have J's future neuralyzer anymore; he gave it back already after their mono-wheels chase.
Suggested correction: What K has is probably their first and only portable neuralyzer, maybe even a prototype. The big one is their main neuralyzer. You may notice there are no dials on this one, so he has no ability to wipe a specific amount of memory.
