Joe_Nobody said:
"That thing looks like Elmer Fudd's shotgun after Bugs Bunny put his finger in the barrel."
As many have said, "I am not a lawyer, nor do I play one on TV."
That being said, when I was in both the book-publishing biz as an editor and while I was at newspapers, I had to learn a lot about copyright laws.
For that bit of text, you are LIKELY to be in the clear.
Casual references to pop-culture figures are not copyright-protected.
It would be the same as if someone writing a romance wrote something like: "Since being assigned to work together, I felt like I was playing Lois to his Clark, but Brent was no Superman."
Those characters are copyrightable and trademarkable, but they aren't appearing in your novel. They're being referenced in a pop-culture context. It'd be like referring to Brad Pitt and Angelina Jolie. You can do it, so long as you tread lightly and don't make it a negative reference.
(A negative reference is probably equally legal to a positive one, but more likely to draw legal attention.)
For example, "They were the superstars of our one-horse town, the Castle Rock version of Brad and Angelina."
(Not likely to draw any ire.)
But, for example, "They were brash, arrogant, rich, and political, the Brad and Angelina of Castle Rock. No one liked them."
(Probably still legal, but Brad and Angelina can afford better lawyers than you can, and even if they lose, they can drain you of money by forcing you to defend your work in court... wanna risk it?)
Lawyers like this:
What you can't do, however, is have Bugs and Elmer in your cover art due to this line. Their graphic depictions would indeed draw litigious attention.
As for text, you can make homage-like references like this.
What would get you in trouble is if you started quoting a Bugs Bunny cartoon written by someone from Warner Brothers. That would start to veer toward infringement, just like with song lyrics.
You could get away with a "What's up, Doc?" perhaps, but I wouldn't take it beyond that.
Helpful?