Commas, gramatically speaking, should never be used before or after the word "that." The correct sentence would have: "James finally saw the movie that his friends . . ."

"Had recommended" could be changed to "recommended", for the sake of simplicity, but the comma error is more flagrant.

This sentence has a comma before the last phrase, but that phrase does not have its own subject. A comma here is therefore not necessary. The corrected sentence reads, "In the interest of advancing her career, Ollie decided to stop going out on the weekends and spend more time in the office."

This sentence has an unnecessary comma separating the subject and predicate of the sentence. This should only happen if there is an interrupting phrase, and there isn't one in this sentence. The corrected sentence reads, "The trouble with taffy is that it requires huge quantities of sugar."

This sentence has an unnecessary comma. Use commas to separate compound sentences, but not compound predicates like we have here. The corrected sentence reads, "Forgetting the key part of the instructions, Charlie preheated the oven but did not prepare the cake."

This sentence has a problem with commas. The comma between “afternoon” and “was” is not necessary because it is not setting off a nonrestrictive clause. It creates an awkward pause in the middle of the sentence. The corrected sentence reads, "The man who usually sits on the park bench every afternoon was not there last Tuesday."

Grammatically, it is best to avoid use of verbs ending in "-ing" where they are not necessary. The correct answer avoids this by using the phrase "owner who started." It is also the most efficient (and least wordy) option. 

The original sentence contains a subordinate clause, "Although I was raised in an English-speaking household," and an independent clause, "I always found French and Spanish much more beautiful." Therefore the comma separating them is correct, and the sentence contains no error. The word "although," especially when used at the beginning of a sentence, is an easy marker for subordinate clauses.

In this question, the original sentence was actually formed by two independent clauses combined with a comma (a comma splice). In order to unite two independent clauses, either one clause must be subordinated, or stronger punctuation must be used. Only the correct answer choice connects the independent clauses with the correct punctuation, in this case, a semicolon.

The list that forms the subject of the sentence, "Angles, Jutes, and Saxons," appropriately separates its items with commas. The comma between "Saxons" and "were" splits the subject of the sentence from the verb, and should be removed. This makes "Angles, Jutes, and Saxons were" the correct answer choice.

The list of names that forms the subject of the sentence is written incorrectly. All lists need to have commas separating their parts from each other for purposes of clarity. The correct answer choice is "Jane, Sally, and Suzy all went to the zoo together."