The following question does not contain an error in subject/verb agreement:

janie, michael and me went to the store to purchase supplies.

true
false

It is true that this sentence does not contain an error in subject/verb agreement. Since the tense used here is past simple, you cannot really make an error in agreement, since this tense doesn't change with regards to the number of the noun. Regardless of the fact whether the noun is singular or plural, the verb will stay the same. 

Astonishing means surprising