Factual error: The helicopter used during the exchange is a Mi2, which has not been in service with the Russians since the 1970s.
Factual error: The third key Easter egg was actually a color-changing flashing pixel in the Atari Adventure game. You had to grab the purple bridge (they looked like outward facing brackets) and go into a box in the lower left corner of the blue maze and move along the bottom left corner. In the movie, it was picked up in the invisible maze. The wall you walk through then flashes along with the pixel, and you may move through it as shown in the movie to see the author's name.
Factual error: Dobermans were not introduced until the 1890s, let alone their ear cropping. (01:00:15)
Factual error: Peter sneaks off the bus using the emergency exit window, which would have triggered an alarm when he released the red safety latch, ruining his stealthy escape.
Factual error: When the jet is taking off from Whitman Air Force base in Missouri, there is a mountain range in the background. There are no mountains in that part of Missouri (highest point in Missouri is about 1700 feet). (01:10:30)
Factual error: On two occasions a ring neck dove lands on the sailboat. The sailboat is making way to Hawaii. Ring neck doves are indigenous to Africa, not Hawaii. They are also not an introduced or invasive species in Hawaii.
Factual error: The rabbits are underneath the landrover, and they get shot out the back whilst holding on to the axle. Land rovers have an enclosed axle with a hub enclosing the diff, so this would not be possible.
Factual error: The radio clip included in the breakfast scene, belonging to XEQK station (La hora exacta) is actually from the early 80s when the advertising campaign "es hora de invertir en Valores Banobras" (which slogan can be heard) was running then.
Factual error: When Elastigirl receives her new bike she discovers it's electric. Later, when she is rescuing the train, the bike hits a mountain and is destroyed in a fireball. What is making the fireball? It's electric so there is no gasoline/diesel to make a fireball, and a lithium explosion doesn't look like that. (00:33:30)
Factual error: They are filming in Brussels and the leaving Mercedes 190 has indeed a Belgian license plate. But it is a fake plate that has a mistake... It shows 1-N82-63X but a license plate in Belgium has always a combination of 1-xxx-123 where the first part always has letters and the second part numbers. Numbers and lettters are never combined. Also it is missing the mandatory sign to prove authenticity. (00:48:30)
Factual error: It is absolutely impossible that the fire suppression system would still be operational at the end of the film. The fire would have destroyed all those systems ages ago, and even if the extinguishers / sprinklers themselves are resistant to fire, I doubt very much the cables that hook them up to the building's computer system survived intact.
Factual error: When Kersey finds his throw down gun and proceeds to practice with it, a bullet ricochets back at him. Lead will reflect off objects and continue in the same general direction or flatten out on a surface but will not bounce back at you. If it did, indoor shooting ranges would kill all of their patrons on a daily basis.