There's not an awful lot in this neighborhood that doesn't have it in for Snoopy.
That's a good question mark in the second panel. Schulz had a kind of ornate style to his type-inspired iconography: serif Zs, fancy question marks, tapered exclamation points. It's one of the little tells that the simplicity of the rendering is an artistic choice and not a cheat.
I've mentioned before that the top row in a Sunday strip are designed to be removed at an editor's option, say to make more room on a crowded comics page. Usually Peanuts will use these in a throwaway joke or just to lengthen the buildup a little, but here I think it actually harms readability a smidge to excise them. Without the top three panels here, we don't have it established that this is Snoopy's first slide, and without that knowledge his Slide Malfunction seems more like an accident than an element of his lack of slidal* experience.
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.