In this episode everyone in the gang agreed that dating someone they see on a regular basis is a big mistake, including Robin dating her co-anchor Curt Irons. Yet in the later episodes, when Robin started to date Don Frank, her new co-anchor, this rule was never mentioned.
During a flashback scene supposedly taking place in '2005' Barney uses his iPhone, which was not released until 2007, and which the character did not have until his 2007 Season 3 time line.
At the end of the story as the Girard's bump into Marshal and Lily in the hall way outside their apartment; a vertical 2X4 (probably one end of set piece) is visible on the right hand side of the screen.