During the St Louis funeral, as The Gent speaks to Comanche, the shadow of the boom microphone can be seen on the ground behind them.
When Comanche first encounters Eddie Zero, he urinates on Eddie Zero's boots. Eddie Zero then draws his pistol, pulls the hammer back and aims it at Comanche's head. Comanche seizes the weapon, re-cocks it and turns it on Eddie Zero.
Comanche's spectacles go missing during his confrontation with Eddie Zero.
If the person accompanying The Deuce at the Cherokee Kisum killing on 4 July 1975 was indeed Billy Wings — as the accent suggests ("Deuce, She's Gott'a Burn") — then Billy Wings would have been at least fifty by 2008, comparable in age to Michael Madsen. The Billy Wings character would have appeared and behaved noticeably older than Vinnie Jones, who was born in 1965.
The rear brake on Pistolero's bike shifts from an early-style drum brake in the opening scenes to a later banana-shaped caliper disc brake in the peyote sequence, before reverting to a drum brake in the final scene.
When The Gent places his pistol on Dani's bar it is pointing towards her; a moment later, once he has removed his gloves, it is pointing towards him.
1% motorcycle clubs in the 1950s, 1960s and 1970s were not integrated and were limited to white men only. The character Goody Two Shoes (portrayed by Michael Beach) would not have been a Black man in that context. Most 1% motorcycle clubs continue to follow those same rules today.
The name Deuce is displayed as "Duece", which is a misspelt form.
Pistolero's rubber knife buckles as he drags it across Billy Wings's waistcoat.
