When James is showing his and Barney's photo to Sam he is holding it at a bottom but next second he's holding it at a middle right after the camera angle switched.
In this episode Barney's bedroom is shown to have a regular wooden bed frame whereas in The Stinsons (2009) he says he has a race car bed.
When Ted mentions they'd need Salvador Dalí, he says it "DAH-lee," rather than the correct "dah-LEE." Since Ted has been shown to be concerned with proper pronunciation and cultural knowledge, it's incongruous that he'd mispronounce the artist's name.