About 9 minutes in, Barney's Christmas tree is up and it is completely decorated with red and green ties.
When Robin finds David Lee Roth's autobiography you can clearly see that the book says "Crazy From The Heat."
Robin refers to Lily as "the wolf". This is a reference to Harvey Keitel's character of the same name in Pulp Fiction. Both are known for their problem-solving skills and staying cool under pressure.
In this episode, Patrice tells Barney that "you give love a bad name" is the first song on her get psych mix. Barney then responds saying "mine too!" Although the only song we hear from Barney's get psych mix is You give love a bad name, it's actually the second song on his mix behind I wanna rock by Twisted Sister