While Cass is getting ready in the bathroom and then goes out to look at herself in the larger mirror, her outfits flip between White and Maroon.
In the gym scene, when Robert drops Cass's iPod, he refers to REO Speedwagon's "Keep on Loving You" as '70s music. That song was released on their 1980 album "Hi Infidelity."
In the bowling alley scene, when Cass (Meghan Markle) rolls her ball between the legs of Robert (Kristoffer Polaha), as the pins are falling, rods are clearly visible pushing them down making it appear that she bowled a strike.