All future scenes with Ted's kids (played by Lyndsy Fonseca and David Henrie) were shot in the first season so they stayed the same age throughout the series.
The Cast Got To Keep Some Of The Props
There’s A Real Engagement On The Show
Barney Stinson Is A Drug Dealer From L.A. Confidential
The Cockamouse was real.
Josh Radnor Is Allergic To Dogs!