A monologue means that there is only one person who's doing the talking, while the remaining characters listen. So, in a dramatic monologue, the character addresses 'a silent auditor'.
An adverb clause is a group of words that function as an adverb. For example: "Unless you run fast, you will miss your bus." The bold words are part of the adverb clause.
I think it's like talking or thinking completely off topic, but I am not sure
The car is a symbol of a new beginning and also the prospect of filling in the shoes of someone important and responsible. They backed up their car with extreme car and caution which is very similar to how they unpacked and moved into their home on the Sullivan Farm. The family wants everything to go perfectly.