But nothing can match the speed of Ali's punch, and the boxing scenes, despite much hard work and the presence of authentic fighters in the ring with Smith, don't come close to the savagery of the real thing.
My only regret is that I don't currently own an authentic replica Rebel fighter pilot jump suit and helmet that I could wear while I play.
It is hard to get authentic statistics for foreign fighters in Syria as the armed opposition is already divided into splinter groups and fighting along different frontlines.
Tally ho! Reeves' super-yacht is called the Aeroboat, and it is building just 12 of these 7,700kg luxury seafarers, with the design inspired by the "sleek lines of the famous Spitfire fighter", including an authentic air intake scoop, aircraft inspired switchgear and the shock-mounted forward seats, a nod to the Spitfire's own landing gear.
Or, to follow Graeme Wood in his recent influential article in The Atlantic: the "fighters of the Islamic State" are "authentic throwbacks to early Islam and are faithfully reproducing its norms of war" (which happen to include "slavery, crucifixion and beheadings").
The film walks a taut line between fantasy and reality, so that the canine fighter pilots feel as important and authentic as Carl's grief.
The tea party is interested in bald eagles, American flags, the founding fathers, Jesus Christ, fighter jets, empty libertarian rhetoric, and other markers of "authentic" American identity and supremacy.
But a few are not authentic or present misleading or deceitful scenes, like this one of supposed Syrian opposition fighters, who actually are bearing toy guns.
On Monday, Time magazine reported that two of its correspondents had seen the video in April "in the presence of several of Abu Sakkar's fighters and supporters, including his brother," and that "they all said the video was authentic".
