Heckle & Jeckle underwent a bit of a transformation once Terrytoons began producing shorts with television more in mind than theatres. Compare this offering, "Sappy New Year", for example, to the classic shorts of the early years, and you'll see what I mean.
By the way, voice actor Roy Halee's name should look familiar to music fans. There was a record producer by that same name who worked with Simon & Garfunkel a few years after this toon came out.
Uploaded by Brett Fletcher:
Jeckle was always the sensible one of the team, wasn't he?