Here are the errors in each sentence:

1. **Sentence 1**: Error in D - "tell them" should be "tell me" (the speaker is likely referring to themselves).

2. **Sentence 2**: Error in B - "much" should be "many" because "garlic" is countable in this context.

3. **Sentence 3**: Error in A - "the breakfast" should be simply "breakfast" as it is generally referred to in an uncountable sense.

4. **Sentence 4**: Error in D - "so slow" should be "so slowly" as it requires an adverb to modify the verb "traveled."

5. **Sentence 5**: Error in D - The question tag should be "does he?" instead of "doesn't he?" since the main statement is negative.

So, the mistakes are:
1. D
2. B
3. A
4. D
5. D