Harry Potter and Me is a Christmas television special by the BBC, broadcast on 28 December, 2001. It is an interview with J. K. Rowling, and is notable for showing pages of Rowling's notes on the Harry Potter series.
New Canon introducedNotes shown in the documentary details students in Harry Potter's year, including Wayne Hopkins, Kevin Entwhistle and Tracey Davis. The class list gives us an idea of some of the identities of the remaining students not mentioned in the series. If the year group is to compose of 40 students, 10 belonging to each house, and even distribution of genders, we can create a better picture of the still remaining gaps. In the series we are introduced to 8 Gryffindor students (Harry Potter, Ronald Weasley, Neville Longbottom, Dean Thomas, Seamus Finnigan, Hermione Granger, Lavender Brown and Parvati Patil), 4 Hufflepuff students (Ernie Macmillan, Justin Finch-Fletchley, Hannah Abbott, and Susan Bones), 6 Ravenclaw students (Terry Boot, Mandy Brocklehurst, Michael Corner, Anthony Goldstein, Padma Patil and Lisa Turpin) and 8 Slytherin students (Draco Malfoy, Vincent Crabbe, Gregory Goyle, Blaise Zabini, Theodore Nott, Pansy Parkinson, Millicent Bulstrode and Daphne Greengrass) of Harry's year. The addition of the class list gives us 4 further Hufflepuffs (Wayne Hopkins, Megan Jones, Roger Malone and Oliver Rivers), 4 Ravenclaws (Isobel MacDougal, Stephen Cornfoot, Kevin Entwhistle, and Sue Li), and 1 Slytherin (Tracey Davis). The uncertain students to be placed comprise 2 female Gryffindors, 2 female Hufflepuffs, and 1 female Slytherin; and we do know that their names are Lily Moon, Sally-Anne Perks, Sophie Roper, Runcorn (given name unknown), and Sally Smith.
However, the two female Gryffindors could also be Fay Dunbar and her friend.
According to the following website, however, is is highly likely that there are actually either 54 (8 Gryffindors, 12 Slytherins, 11 Hufflepuffs and 23 Ravenclaws, making 54 students in all) or even possibly 50 students (10 Gryffindors, 10 Slytherins, 9 Hufflepuffs and 21 Ravenclaws, making 50 students in all).
Sometimes, the students mentioned in Rowling's list but not mentioned in the books are only considered half-canonical or even non-canonical.