After Scott retrieves the lab from Sonny, he walks back to shore with it, leaving Sonny knocked-out on the ferry, but after the thugs are tazed, tied up, and truth-serumed, Sonny is with them back on shore.
When Hope is fighting the henchmen in the kitchen, you see one guy grab the only knife on a cutting board and throw it at her. In the slow motion scene you even see his long follow through. Yet as we track Hope, she dodges 3 knives in rapid succession which could not have been thrown that fast.
Also the knives are not flying end over end as they should be.
When Thanos snaps his fingers in Infinity War during the Battle of Wakanda, it's the middle of the day. San Francisco is 10 hours behind Wakanda, which would means at the moment of the snap it should be night, yet when Scott is stranded in the Quantum Realm it's also daytime.
Some scenes in the film take place in San Francisco, California and when police vehicles have their emergency lights on, they are missing a steady red light. According to the California Vehicle Code, all law enforcement and emergency vehicles are required to display at least one steady red light in the front of the vehicle when the emergency lights are on.
When Hank Pym is travelling into the Quantum Realm, his vehicle temporarily pauses at the microscopic level to get its bearings. He is surrounded (and nearly eaten) by floating tardigrades, a very resilient microscopic creature. Tardigrades natural habitat is in water, yet there is no indication that he has traveled into water.
Throughout the movie the lab is shrunk and moved, it is also moved haphazardly yet when the building is enlarged again at a new location, it automatically has electricity, plumbing, and nothing seems out of place when it was pretty much in an earthquake. However we are given explanations for these in the movie. Firstly, the lab is entirely self contained, and powered by the giant AA batteries we see. Second, they arm "gyroscopic stabilizers" before they shrink the lab, to protect its contents.
The Wasp's "suit" is RED when she initially enters the quantum zone after shrinking to fit between the molecules to deactivate the missile. When Hank Pym rescues her, she has on a shirt of some sort covering her torso, but it looks as if the suit is BLACK. Where did the shirt come from and how did her suit change? Was there a department store in the quantum realm ? However if observed closely once Hank and Janet are leaving the Quantum Realm it is shown that there is a city with buildings in the realm showing that their are beings who live there. It was also confirmed by the director there are civilizations in the Quantum Realm. This is probably where Janet not only had food and shelter but where she probably received new clothes.
Throughout the movie, as in Ant-Man, the mass (weight) of the objects which shrink and enlarge is never handled consistently. Sometimes objects (such as the people) retain their full weight when made very small, hence able to affect much larger objects with great force. But the same is not true when large heavy objects like cars and buildings are made small. Also, when Scott becomes very large, his mass is proportional to that, instead of remaining his actual ~200 lbs.
The character of Ghost can 'phase' through vertical surfaces such as solid walls, so one should expect that Ghost would also be passing through the horizontal surfaces such as floors! Yet this does not happen.
The movie is set in San Francisco, but early in the movie, a Fake Cable Car is seen outside the Oui Restaurant, and near the end of the movie a Fake Cable Car is again on screen. The vehicle at first glance is meant to look like a Cable Car, but has huge rubber tires instead of metal wheels, and there is no Tramway Track visible because the filming locations were not at any of the three San Francisco Cable Car lines.