This episode is a sequel to episode 3, "Lion-Hearted Huck". Huck mentions he has tried catching the lion last year, as well as every year before that too.
In fact, this episode aired on 10/10/1959 exactly 51 weeks after "Lion-Hearted Huck" premiered (10/16/1958), almost an entire year.
Also, the lion's name is revealed to be Leroy in this episode, while he remained nameless in his first appearance.
Huck: When you're trying to catch a screwball lion, you've got to be a screwball.
Lion: Not hiding, just staying out of the sun. Shadiest place in the jungle, under an elephant.