In Harry Potter and the Goblet of Fire, when the contestants enter the arena for the third task, the Beauxbatons girls in the audience can be seen dancing the Macarena.
During the breakfast scene of the Great Hall in Harry Potter and the Order of the Phoenix, students can be seen eating parodies of real-world cereal brands with the names such as Cheeri-Owls and Pixie-Puffs, with color schemes similar to those of Cheerios and Sugar Puffs boxes, respectively.
In Harry Potter and the Order of the Phoenix, James Phelps and Oliver Phelps, who play Fred and George in the franchise, make a cameo appearance in the picture of the original Order of the Phoenix as their deceased uncles, Fabian and Gideon Prewett.
14Black family tree
In Harry Potter and the Order of the Phoenix, when Sirius joins Harry in the room with the Black family tree, to the lower left of the door is a Starbucks logo. The “siren” has been stylized to be in keeping with the decor of the room, but she is wearing a crown and holding both her fins aloft as in the Starbucks logo.
In Harry Potter and the Half-Blood Prince, the smoke coming out of the love potion changes color to that of whatever Hermione is describing. The final scent that comes out of the potion is orange, as is Ron's hair. That's why Hermione lies saying that she smells “spearmint toothpaste” because she obviously doesn’t want to say “Ron’s hair” out loud. Also, after Harry arrives at the Burrow, Ron pokes Hermione’s lip and says she has toothpaste on it.
16Tom Riddle Memory
In Harry Potter and the Half-Blood Prince, Dumbledore reaches for a Tom Riddle memory dated 1938. He tells Harry that this was the first time he met Tom, but to the left, there is a memory labeled Tom Riddle that is dated 1937. It is most likely someone else's memory relating to Riddle terrorizing two children in a cave at the seashore, which is described in detail in the book.
Arthur Bowen, the child actor that plays Harry's son Albus Severus Potter in the epilogue of the final movie, can be seen in Harry Potter and the Half-Blood Prince buying roasted chestnuts at a stand in the Diagon Alley.
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18Snape vs McGonagall
In Harry Potter and the Deathly Hallows - Part 2, Professor Snape still helps the Order when he redirects McGonagall’s spells to knockout his fellow Death Eaters. He also takes their wands before he flies out the window to make sure they could no longer harm any students. In the books, there are no Death Eaters around him so it was a nice touch to add this detail to the movie.
In Harry Potter and the Deathly Hallows - Part 2, Lucius Malfoy’s Azkaban prisoner number tattoo can be seen on his neck for a brief moment. After Order of the Phoenix, he and other Death Eaters were arrested after they were caught in the Ministry. He only gets out when Voldemort started to take more power by Deathly Hallows.
In Harry Potter and the Deathly Hallows - Part 2, when all the professors leave the castle to cast the defensive shield, Professor Slughorn can be seen drinking a bottle of what looks like liquid luck.