Check for Provide an accessible overview (MOS:INTRO): Done
Major Point 1: Plot "The series follows the adventures of Finn (voiced by Jeremy Shada), a human boy, and his best friend and adoptive brother Jake ... he receives a call from Flame Princess, reaffirming their relationship." (summarised well in the lead)
Major Point 2: Production "The episode was written and storyboarded by Tom Herpich ... Wallace Shawn as Rasheeta." & "The appearance of Finn as an adult was based on Howard Keel's character from the 1954 musical Seven Brides for Seven Brothers, which is a favorite of episode co-storyboarder Wolfhard." (summarised well in the lead)
Major Point 3: Reception "It originally aired on Cartoon Network on April 8, 2013." & "The episode was viewed by 2.75 million viewers ... making it the series' first Emmy win." (not a concise summary of the Reception section)
Check for Relative emphasis: Done
Major Point 1: Plot "The series follows the adventures of Finn (voiced by Jeremy Shada), a human boy, and his best friend and adoptive brother Jake ... he receives a call from Flame Princess, reaffirming their relationship." (the lead gives due weight as is given in the body)
Major Point 2: Production "The episode was written and storyboarded by Tom Herpich ... Wallace Shawn as Rasheeta." & "The appearance of Finn as an adult was based on Howard Keel's character from the 1954 musical Seven Brides for Seven Brothers, which is a favorite of episode co-storyboarder Wolfhard." (the lead gives due weight as is given in the body)
Major Point 3: Reception "It originally aired on Cartoon Network on April 8, 2013." & "The episode was viewed by 2.75 million viewers ... making it the series' first Emmy win." (the lead does not give due weight as is given in the body)
Paragraphs should be short enough to be readable, but long enough to develop an idea. (WP:BETTER)
Fix "For his work on the episode, former lead character designer Andy Ristaino won an Emmy Award for "Outstanding Individual Achievement In Animation" for his character designs, making it the series' first Emmy win" in the Reception section.
Check for Standard appendices and footers (MOS:APPENDIX): Done
"supervising director" ... [2] (Check on source 2, inaccessible)
"Big thanks to [Wallace Shawn] … who I finally got to cast in the show, thus shortening my bucket list."[3] (Check on source 3, successful, "Big thanks to Kent and Pen and Nate, and to secret guest stars J.F., M.S., and last but not least W.S., who I finally got to cast in the show, thus shortening my bucket list. Hope y’all dig it!")
"probably my favorite musical".[5] (Check on source 5, successful, "It’s probably my favorite musical, or at least in my top three. It’s genuinely wonderful and it’s so nuts.")
"focuses on building character".[9] (Check on source 9, successful, "focuses on building character")
"teleport[ing] to … alternate dimension[s]".[9] (Check on source 9, successful, "In that comic, Captain America has been teleported to an alternate dimension ruled by Arnim Zola")
"slow down, don't freak out, and communicate."[9] (Check on source 9, successful, "It’s a lesson that all young lovers have to learn at some point: Slow down, don’t freak out, and communicate.")
"hilarious" ... [10] (Check on source 10, successful, "it is hilarious (and then touching, all in one episode).")
"pretty awesome".[10] (Check on source 10, successful, "We get to see Finn as an adult in “Puhoy,” which is pretty awesome.")
"Adult Finn" ... [10] (Check on source 10, successful, "He might go on a lot of adventures as a kid, but !Adult Finn is badass.")
"pillowy world" ... [10] (Check on source 10, successful, "Finn must come to make a life for himself in this pillowy world, and")
"badass".[10] (Check on source 10, successful, as above) (also addressed in WP:F***)
Check for Likely to be challenged: Done
Check for Contentious material about living persons (WP:BLP): NA
Lead Image (Puhoy.jpg): This image is a screenshot of a copyrighted television program or station ID. As such, the copyright for it is most likely owned by the company or corporation that produced it. It is believed that the use of a limited number of web-resolution screenshots (1) for identification and critical commentary on the station ID or program and its contents, and (2) on the English-language Wikipedia, hosted on servers in the United States by the non-profit Wikimedia Foundation, qualifies as fair use under United States copyright law. Other use of this image, on Wikipedia or elsewhere, might be copyright infringement.
Check for copyright status: Done (Non-free content)
Purpose of use in article (WP:NFCC#8): To illustrate the character designs in the episode, which resulted in character designer Andy Ristaino winning the series' first Emmy Award.
Replaceable?: No. (Since it's a copyrighted character, there are no free alternatives available.)
Caption - An adult Finn, surronded by his pillow family. For his character designs in the episode, Andy Ristaino won the series' first Emmy Award. (succinct and informative, spelling error surronded should be surrounded)
As per the above checklist, the issues identified are:
The lead does not provide an accessible overview and does not give relative emphasis to the Reception as is given in the body.
Paragraphs should be long enough to develop an idea. Fix short paragraph in the Reception section.
The caption "An adult Finn, surronded by his ..." has a spelling error, surronded should be surrounded.