When Stu and Tom are driving in the truck, in the snow, tire tracks can be seen in the snow, ahead of them. If everyone had been dead for five months, who made the tracks in the fresh snow?
When Dayna is found to be a spy, she is forced to get dressed. When she puts her dress on, her black underwear is visible beneath. In the next scene, when she is brought before Flagg, she is no longer wearing any underwear under her dress, which is still very transparent.
In the scene where Stu and the doctor are fighting. Three shots are fired and the third bullet hole appears long before the third shot is heard.
When Stu and Tom see the bomb explode, Stu Redman seemingly quotes the Bible (Rev 6:7-8) "I saw a pale horse with a pale rider upon it. The name of the horse was Pestilence, and the name of the rider was Death." However, the true verse does not name the horse, which is not named anywhere in Revelations, or in the Bible, or in any other religious book. Some interpretations use Pestilence or Plague instead of Death as the name of the rider, but nowhere is the horse named.
Trashcan man wouldn't have been that radiated because before the end of the world the facility (including the missiles) would have been monitored better than that.
When Lloyd Henreid is shooting at Glen, he fires once and then four rapid shots then the gun begins dry-firing. However it is a six-shot revolver, as can be told when there is a close-up of the pistol as it fires.
Ralph walks from Boulder to Vegas, a distance of over 800 miles, including over mountain passes, eating only what food he and the others can find, yet he doesn't appear to lose any of his quite hefty weight at all.
When it's shown that Lucy is sleeping with Lloyd while acting as a 'scout' there is a boom mic visible in the mirror behind them.
'Trash' would have done what he did, regardless of the 3 spies and 4 men headed from Boulder, making everything they did a waste of time. None of the 3 spies returned with any information, and if they had, the people they were supposed to report it to were not at Boulder anyway as they were also headed, on foot, to the same place they'd just send spies to.
The boom mic is visible in the mirror of Lloyd's apartment when he and Dayna Jurgens kiss on the bed.
When Lloyd and Dayna are kissing and cuddling on the bed, the boom mic is visible in the mirror behind them.
When Lloyd and Dayna are in bed, the boom mic is clearly reflected in the bedroom mirror for several seconds.
When Dayna and Lloyd are making out at the beginning of the episode, the boom mike is visible in the mirror behind them.