Other mistake: After the weird scene with the dude in a wig, there's one quick display of all the various pages that talked about the viral video. One of those pages is written in Italian, but it's obviously machine-translated and/or not supervised by anyone speaking the language, since it contains multiple mistakes (including also an edit flub with the picture of the brothers on top of an article about medusae). Even the name of the magazine is certainly pretty bad for an Italian one; "Daily du Jour", which is French, not Italian. (00:14:15)
Other mistake: Mike and Dave put the ad on Craigslist, and people begin to share it through social media. The first time we see someone share it through Facebook the date of the post is "March 19 at 12:38 AM." Moments later there's a zoom in and now the date is still the 19th, still at 12:38 AM, but the month changed to May. (00:12:30)