Andy references "his brothers going to sailing camp growing up", however throughout the rest of the series, Andy officially has just one brother, Walter.
When Erin presses play on the boombox, she accidentally presses skip backwards as it goes from track 01 to track 20. In the next shot it's playing track 01 again.
The sprinklers come on, but the candles don't get extinguished. This should also be put into "Misc" as a plot-hole but was a really poor attempt to replicate Jim and Pam's engagement.