ETA: I wasn't even close; the strip focuses on Lizzie and Elly and can best be described by the phrase "adhesion failure-induced trauma in an urban setting".
Panel 1: We're at the checkout at some store or other. As the cashier rings up Elly's purchase, we see our hero with bills in one hand and a change purse in the other as a guy who looks like John but isn't because he doesn't wear glasses and some random older lady.
Panel 2: Suddenly, Elly notices something is wrong: she doesn't know where Elizabeth is and yells LIZZIE!!.
Panel 3: As a panicked Elly yells "LIZZIE! Where are you?", we see Lynn's low opinion of the average man made manifest; that's because PseudoJohn and Random Lady play statue instead of helping Elly.
Panel 4: We shift our focus to Lizzie. As usual, she's clinging to someone's legs so as to not get lost.
Panel 5: She looks up so as to see Mommy's familiar face and finds a complete stranger smiling down at her.
Panel 6: The end result: a piercing SHRIEK!!!
Panel 7: The guy hands her off to Elly and says "Same jeans, different legs."
Summary: We've just been shown the reason why Lynn things Lizzie has to cling to Elly's shoulders. It's not enough to simply cling to someone for safety, you see; you have to see who you're latched onto. Never mind that Elly would have been smarter to have Lizzie in a baby carriage or something, her way is the best.