When Nadine is in the house running from the bad guys, the back slit of her skirt shows a white slip. In all other scenes, no slip can be seen.
When Nadine is looking through her closet for lingerie, she pulls down a large gray box labeled Scarborough's. This is an '80s-era shipping box for the former high-end department store, not a '50s-era box.
The film takes place in 1954, however, a small version of the red and white Canadian flag that was introduced in 1965 can be seen in Vernon's bar.