In May 2022, a since-deleted Redditor started a discussion in the r/harrypotter subreddit about the mirror shard appearing out of nowhere in "Harry Potter and the Deathly Hallows – Part 2." This led to u/tramspace sharing their own observation: "Same kind of thing with the [M]auraders [sic] [M]ap. Lupin just somehow knows exactly how to use the map. It never explains that he was one of the people that made the map."
Remus Lupin (David Thewlis), Peter Pettigrew (Timothy Spall), Sirius Black (Gary Oldman), and James Potter (Adrian Rawlins) being the creators of the Marauder's Map was fleshed out in the book but completely glossed over in the 2004 film, with the true identities of Moony, Wormtail, Padfoot, and Prongs never revealed in the script. Redditor u/tandemtactics agreed with u/tramspace, writing, "Literally one line of dialogue could have made that clearer and been a fun reveal."
However, u/ldtka disagreed: "It's not strictly needed, especially in movies, to explain every minute detail. Often times [sic] it's better to power through, which is a major different [sic] in medium between books and movies." While a story's plot holes may not matter as much when watching a two-hour movie compared to reading a book, with so many people confused or just completely lost, there's a good argument for including an explanation.
