Reword the topic sentence on paragraph 4: "The other matters" sounds vague, and you could use a more effective transition word than 'other.' You also use passive voice (are facing); rephrase the sentence to read something like : Moreover, the central characters of the show face..."
Sentence 3: Depending on your teacher's requirements for the assignment, you might need a citation following your quote.
Sentence 4 and 5 both start with the pronoun 'this,' which is pretty vague, not to mention repetitive. Reword both sentences to leave out 'this;' a good general rule of thumb is to avoid starting sentences with vague pronouns like: this, these, there, it.
Paragraph 5: This paragraph needs a better topic sentence to tie it into your review. You just had a paragraph about relatable themes, so how does product placement figure in. Your topic sentence ties it into the whole food issue present in the food, but it still feels choppy. Since this is a review, weigh in on how viewers might feel about the use of product placement in the show. You mention that it is advantageous for the companies, but how will the average viewing audience respond?
Overall, both paragraphs were well written with few major grammatical errors.