The first two babies in Barney's slideshow are Neil Patrick Harris' children with husband (then fiancé) David Burtka. Twins (born Oct. 12, 2010) Gideon Scott Burtka-Harris and Harper Grace Burtka-Harris.
"Murder Train" from Sandcastles in the Sand plays during the physical violence montage.
The third 'profile' at the beginning belongs to Alicia P. who lists Josh Radnor as one of her favourite actors.
The phrase "I gots to know" is a famous line from the movie Dirty Harry (1971) and is spoken three times by three different characters.