This is the first episode that doesn't include Ted addressing his kids at the very beginning
It can be argued that Robin and Lily are to blame for the death of the Fiero - they are responsible for the cigars being switched out for chopsticks, which is what distracted Marshall and caused him to hit the pothole.
The song featured in this episode is "I'm gonna be" by The Proclaimers. More often referred to as "500 miles".
A "Cassingle" was a popular term used for a Cassette Single, which was a music cassette which instead of containing a whole album usually contained 2 songs - One song on each side of the cassette.
When the gang pushes the car, an instrumental version of "I'm Gonna Be" aka "500 Miles" is played.