Can't really blame Schroeder for getting angry over this one!
Two things. First, Peanuts characters seemed to mellow out a lot over time. Even the mighty Lucy rarely seemed to wear an expression of this ferocity. Second, the rules concerning the depictions of adults and their communications was much less in force here. In many later strips, you wouldn't have seen a word balloon over the radio, and the joke probably would have had to be reworked into a conversation between two of the kids.
The text of ROASTED PEANUTS is copyright 2009-2011 by John Harris. No copyright is claimed over the comic strips, which are here under the principle of fair use. Strips presented for review purposes only. We love Peanuts a whole lot, and wouldn't dream of exploiting it. Please don't sue us; we're only trying to love. Thank you for reading this notice.