Jade knocks Duke over the head with a hammer, causing him to fall down the stairs and crash into the table. Duke whines that she broke his leg, yet two seconds earlier he moves both legs perfectly fine. Had he actually broke either leg, he wouldn't have been able to move them.
When the waitress slams the bill down the table (after Simone insults the diner's food), in the following wide shot, there is no bill on the table.
In the end framing sequence at the morgue, the assistant loads the unidentified body onto the cooler drawer feet first. Cadavers are almost universally loaded in head-first, with the ubiquitous "toe tag" attached for easy identification upon opening the compartment door.
At 9:56 in the invitation says the wedding is on Sunday October 9th 1984. October 9, 1984 was on a Tuesday.