"It received mixed to positive reviews from critics for its storyline and many cultural references." -> just put mixed.
"It received mixed to positive reviews from critics for its storyline and many cultural references." -> no reviewer talked about cultural references, so put; "* "It received mixed reviews from critics for its storyline".
"According to Nielsen ratings, it was viewed in 9.2 million homes in its original airing" -> "According to Nielsen ratings, it was watched by 9.2 million viewers in its original airing".
"along with several recurring guest voice actors for the series" - Reword. -> "along with several recurring voice actors from the series".
Plot
During a costume party, Lois suggests that Brian find a new girlfriend. -> Link Brian (seperate section), and "During a costume party, Lois suggests that Brian should find a girlfriend."
"he finds out that Carolyn began to date Cleveland" -> "he finds out that Carolyn has began to date Cleveland".
"Feeling sorry for Brian, Stewie suggests that find Cleveland's ex-wife, Loretta, and convince her to reconcile" -> Need to expand on the sentence - why do they look for her?
"Since both Brian and Cleveland have been cheated on by the same woman, they make amends." -> for what?
Production
"It was written by the show's main voice actor" -> Makes it sound like Henry is the main character of the show.
Rmv "and veteran writer".
"In addition to the regular cast, actress Kat Foster portrayed the voice of Carolyn, and actress Meredith Baxter portrayed herself" -> Reference?
"Recurring guest voice actors" -> Dodgy term of phrase.
CR
"The episode's title is a reference to the British romantic comedy film Love Actually" -> Source?
"Woodstock also makes a cameo appearance" -> Explain what show he is from.
"Cleveland's deadpan exclamation of "...and boom goes the dynamite" during sex with Carolyn is a reference to an Owen Wilson line from the film Shanghai Noon used during Ball State University student Brian Collins' appearance as television sports anchor, which became an Internet sensation." -> Too long and Reference?
"Cleveland and Carolyn meet at a Starbucks" -> Back this up with an overview of the episode.