Using multiple subordinate clauses

English

There is a comma after the independent clause, before the next subordinate clause.

There is not a comma before the independent clause.

There is nothing wrong with this sentence.

What's wrong with this sentence? "Although it was Tuesday afternoon, Charlie decided to go to the sweet shop, down the road."

There is not a comma before the independent clause, after the first subordinate clause.

What's wrong with this sentence? "at the football match, He decided to buy chips but he dropped them when cheering."

What's wrong with this sentence? "During my drama exam, I forgot all my lines because I was so nervous."