Badly drawn butts: Panel 5---Yikes!
Panel 1: Now, why does April have to start by telling him "Mom's ticked"? He knows that; that's why he's hiding in his train workshop. But doesn't he look all cute in his engineer overalls and cap. And what is Edgar doing---ogling him?
Panel 2: Ah! Well, that is a good point. I think it's generally been like that all along: John's penis extensors are too fragile for any practical usage, so Elly's workhorse does the heavy hauling. I can understand her frustration, then.
Panel 4: But that's a good point, too: she could have told him herself.
Panel 5: Okay, I must be a bit slow on the uptake. I can tell from Elly's expression that John's remark is self-serving in some way, but I can't pin it down. What I do know, though, is that John is certainly dressed appropriately to be in the same panel with that ginormous caboose!