We advise whoever was responsible for this foul up to stay out of whip and gun range of Indiana Jones. The action movies are all also historical dramas, with the scenery designed to go with the story. That means close attention has to be paid to how buildings look, what technology is on display, and what everyone is wearing - even the extras. Somebody on the set of this epic was sleeping on the job.
In the background of this scene, where we see Harrison Ford in his iconic role drowning his sorrows at the bar, there's a guy walking down the street without a care in the world, dressed in a t-shirt and jeans. It doesn't look like one of the production staff, so presumably someone saw an extra dressed like this and thought it was fine to wave him onto the set, figuring nobody would notice. Wrong!