After Max digs out Atom he is covered in mud. In the shot from the cab he is clean (from 41:16 to 41:19?). The next shot at the gym, Max is again covered in mud.
When Charlie's robots are in his truck and not about to fight they are turned off. Presumably this is done so that the robots don't cause any damage while being transported. But in one scene Atom is shown to be powered up (as shown by his eyes being lit up) while Charlie is driving.
When Noisy Boy steps out of the packing crate, the directions of the sunlight/shadows on the floor change.
After Zeus' fight with Axel Rod, Max claims that Zeus threw punch after punch. However, shortly before the final fight between Atom and Zeus, footage from Zeus' previous fights is shown and that reveals that he only threw two punches at Axel Rod; the first decapitated him and the second sliced him in half.
Given that Hugh Jackman is left-handed, Atom is seen at times mirroring Charlie rather than mimicking him. In many scenes, especially in the fight between Atom and Zeus, Atom is clearly fighting right-handed while Charlie is shadow boxing left-handed. This is perhaps the reason why Atom is seen to be alternating between mimicking and mirroring even though according to how shadow boxing is explained in the film he should be only mimicking. This is also easily seen, though, when you notice the person running the shadow function either facing Atom or not. The shadow apparently mirrors when the operator is facing him and in mimic when not.
It may seem incongruous for a "futuristic" movie set in 2020 to be filled with vehicles of model year 2010 or older. Only Charlie's truck seems to be "futuristic". However, it was an artistic decision to set the movie in a familiar world viewers could identify with. Director Shawn Levy states "I wanted the world to feel really familiar, so that the characters would feel really relatable. The cell-phone we used five or ten years ago looks different from today, but a diner still looks like a diner."
After Charlie and Max get beat up an aerial shot over the city is shown filmed in reverse. Look at the flags and the cars on the street driving backwards.
(at around 22 mins) The story is set over the summer of 2020, but the trees show beautiful fall foliage.
Noisy Boy traveled in a packing crate with no packing/bubble wrap or straps.
The first fight takes place at the San Leandro County Fair, at the San Leandro County Fairgrounds. San Leandro is part of Alameda County in California, and such an event would be called the Alameda County Fair and take place at the Alameda County Fairgrounds in Pleasanton.