Raiders of the Lost Ark (1981)
Although young Harrison Ford is quite the eyeful as it stands, don't miss the guy in the background who seems to have mistakenly walked into the wrong dimension. Jeans and a t-shirt aren't exactly common attire for the 1930s. Maybe he was just ahead of the times...
Pride & Prejudice
Pride & Prejudice was published by Jane Austen in 1813, and the movie was intended to reflect that time period. Lizzie (Keira Knightley) can be seen above trekking through a muddy field in rubber boots, but rubber boots weren't even invented until 1853. If they wanted to maintain historical accuracy, Knightley would probably have had uncomfortably damp feet after this scene.