It says cobbler on the menu, and cobbler is what you get.

Waiter, there's a dime in my soup!

It’s New Years, and you’re in the Southern United States. (Putting a dime or other coin in a dish, specifically black-eyed peas is a New Years tradition in the South)

Waiter, there’s a lightbulb in my soup!

You did ask for a little, light soup, did you not? 

Waiter, there’s a handkerchief in my soup!

That's a token from Mr. Tumnus so you know you can trust me! Would you care for some pan-fried fish as your second course?

Waiter, there's a harmonica in my soup!

You asked for some music along with your meal, didn't you?

Waiter, there's a pencil in my soup!

It’s just our way of encouraging people to write reviews. 

Waiter, there’s a book in my soup!

Didn't you ask for alphabet soup? The cook figured that it would be easier to put a whole book in rather than cutting out the individual letters.

Waiter, there's ring in my soup!

At lassst, there it is, my precioussssssss!  

Waiter, there's a sock in my soup!

It's to give you the warm fuzzies.

Waiter, there's a diving board in my soup!

Well, the description does say “soup so good that you can just dive right in!”  

Waiter, there’s a comb in my soup!

Just in case you wanted to straighten out your noodles. 

Waiter, there’s a hammer in my soup!

The chef wanted to let you know that it wasn't a Pinterest fail. Nailed it!  

Waiter, there's a teabag in my soup!

Didn't you want the grean tea soup? Oh... oh, the green bean soup. That makes much more sense.

Waiter, there's a log in my soup!

The menu did say Lumberjack stew. 

Waiter, there's a wallet in my soup!