Birthday Puzzle in the Sand

Can you find the four differences between these two happy-birthday messages? Click on each picture to bring up an expandable version.

Happy Birthday version 1 of 2.

Happy Birthday version 1 of 2.

Here is version #2:

Version 2 of 2

Version 2 of 2

Many thanks, and Happy Franklin’s Birthday to Diane Guntzel of Clinton, Iowa!