When Lily tells Ted about the skateboarding dog, we see the event in flashback with Robin, Barney, and Marshall on the left and Lily and Zoey on the right by the bar. But when Marshal tells Ted he changed the course of Blitzstory, we see the same flashback, but this time The Blitz is suddenly there and is the most prominent person in view.
Barney: Robin, I will pay you to be The Blitz. $100! No, $10,000! No, 60 bucks. What's a lot of money for someone like you?
Marshall: Dude, The Blitz isn't something that can be bought or sold.
Zoey: Yeah, it's not like Ted's integrity.
Ted: What was that? I was distracted by the four carat diamond your 53-year-old husband bought you.
International Airdates: United Kingdom: February 24, 2011 on E4; Australia: March 10, 2011 on Channel 7; Germany: October 5, 2011 on ProSieben; Czech Republic: January 30, 2012 on Prima COOL
The guys have an in-joke where they yell, "The gentlemen!" Also, there is the imagery of the 'the blitz' curse being passed as smoke which enters the new host via the mouth while they sleep. This is a reference to the Buffy the Vampire Slayer episode "Hush" where the villains are called 'The Gentlemen' and there is imagery of smoke exiting each host via the mouth whilst they sleep.
The random numbers the Blitz yells out at McLaren's for Marshall to text a picture of his junk to, "4 8 15 16 23 42," are the same mystic numbers featured throughout the entire run of the show, Lost, which also starred Blitz portrayer Jorge Garcia as Hugo "Hurley" Reyes, who felt he was cursed by those numbers. Additionally, when Barney misses something cool he says, "You told me I had to leave the building," and Blitz's reply was "Sorry, but I was on that island for what seemed like eternity," referring to the island the Lost crash survivors had to live on.