When Quaid/Hauser is fighting the synthetic on top of the six-way elevator car and the synthetic loses an arm, this is a nod to the original film where Michael Ironside's character suffered in a similar way.
The announcer in the holographic advertisement for Recall says, "We can remember it for you." The film is loosely based on a short story by Philip K. Dick called, "We Can Remember It For You Wholesale."
When Quaid retrieves his safe-deposit box, next to the United Federation of Britain 50 currency unit note with Barack Obama is a 1000 currency unit note with a picture of Loren Wiseman, father of director Len Wiseman.
Most of the futuristic-looking firearms are actually contemporary weapons with little to no modification. The silver handgun carried by Lori Quaid and by various police in its blued form is a Chiappa Rhino .357-caliber revolver with a laser sight fixed under the muzzle; the police carry TDI Vector .45-caliber submachine guns; and the resistance fighters mostly carry Heckler & Koch firearms, including G36C assault rifles and UMP and MP5 submachine guns.
The bank that Douglas goes to is called the First Bank of New Asia. New Asia was the original title for "The Colony", but was changed to "The Colony" in order for people to get the impression that it was more of a melting pot.
Quaid's real name "Hauser" was the name of a 19th century foundling, Kaspar Hauser, who seemed to have spent his entire life in a dark room with no connection to the outside world. He appeared as a teenager and was thought to be a heir of noble descent. This theory was disproved later. He died of a knife wound and told that he was attacked (like Quaid) but there is no positive proof that incident really happened.
In the Secret Agent Scene, as the chemical is about to injected into Quaid's arm, McClain tells his assistant to remove the needle from Quaid's arm before the chemical enters his body when McClain learns that Quaid is actually a spy. This hints that it may not be a dream and that it could be for real. If it was a dream, the dream would have began when the chemical is injected into his arm.
Douglas Quaid mentions that his birthday is August 29. The role of Douglas Quaid was played by Arnold Schwarzenegger who also starred in Terminator 2: Judgment Day (1991) in which August 29 is the title date.
There is a welcoming sign at the station in the Colony, at both sides of the Colony's logotype, that is written in Czech and Bulgarian languages: both Slavic languages using Latin and Cyrillic alphabet respectively. Great Britain, the Czech Republic and Bulgaria are European Union member states. It seems at the end of the XXI century Czechs and Bulgarians live in the Colony, modern day Australia, while at the beginning of this century they are not among the 40 largest Diasporas of immigrants in Australia.
During the highway chase scene, about halfway through the film, Lori's unit number is 905 according to radio communications. 905 is an area code for much of the Greater Toronto Area, where the movie was filmed.
The trivia items below may give away important plot points.
Moments before Quaid attempts to pass through the security checkpoint disguised (via holographic necklace) as an Asian man, we see a heavyset lady in yellow. She's a red herring for Quaid, and fans of Total Recall (1990) will notice her intended resemblance to Quaid's disguise in the earlier film. She even gives the same answer to the guard ("Two weeks").
In an extended version of the film, Doug pulls the plaster from his right arm and realizes that the injection mark (the peace symbol) from the memory-implant procedure at Rekall is missing. This hints that Quaid could be dreaming.