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)
Answer: Earlier in the movie, the way K was talking about Boris was different than what J had come to expect of his partner. So J wanted to know what happened between Boris and K at Cape Canaveral that changed him. So more of what did Boris do to K rather than just the report of what K did.