His being lost had nothing to do with confusion (I think in fact the system wasn't confusing), but with a "fare increase."  It was a campaign song to fight such.  Charlie didn't have the unfair nickle.

Peter Montgomery wrote:
Just as a piece of fun, CR, your observation reminded me of an old
folk song that, I think the Kingston Trio did, about the Man Who Never Returned,
for he got lost in the Boston Subway, which was one time notoriously confusing.
 
Cheers,
Peter