Richard Manning purchased the first of these original production cels labeled as being from this cartoon; the second cel was seen up for auction on eBay and seems to be just a moment later in the sequence:
Note: The backgrounds may be entirely wrong; only the
cels are original production art.
Judging from the expressions of the characters, it appears to
take place as the Warners leave the movie theater. My theory
(and remember, this is just a theory!) is that Dot was complaining
about the amount of junk that people were throwing into the streets.
Of course, all that junk came from Wakko's sack, and in the second
shot we see them pass the mallet he had dropped on the street earlier
in the episode.