The document presents two sentences with different meanings due to punctuation. The first sentence "Let's eat grandpa" could be interpreted as eating one's grandfather due to the lack of a comma. The second sentence "Let's eat, grandpa" uses a comma to change the meaning to eating and addressing one's grandfather.

2. 
Can you see anything wrong with this
sentence?

Let’s eat grandpa.

4. 
Let’s eat, grandpa.