Because of this episode's unusual runtime, "The Day They Hanged Kid Curry" was not included as a part of the standard Alias Smith and Jones (1971) rerun package. It occasionally appeared in syndication as a TV movie, under its own name, with the series title bluntly edited out of the regular series' opening credits.
This episode took 11 days to film (as opposed to usual 6 days for a 1-hr episode), causing a time-squeeze which would subsequently haunt the series following Pete Duel's tragic death. Part of the delay was due to extremely hot weather on location shots, which aggravated guest star Walter Brennan's emphysema.
Actors Paul Fix and Henry Jones, who played a mystery writer and a supposedly dim-witted maintenance man respectively in The Bad Seed (1956), reunite 15 years later, here with Jones' character upped quite a few notches; he plays a judge, to Fix's lawyer role.