A reliable source on IMDB has leaked a scene from the script regarding the "modified" memory; shots of this scene came from multiple sources.
HBP Script Leak
That's my Won-Won.
Excuse me, I have to go vomit.
As Hermione exits, Harry spies Ginny, in an alcove, sitting
by as Dean laughs with SEAMUS. Looking up, she sees Harry,
gives a feeble wave. He waves back. CUT TO:
86 INT. DUMBLEDORE'S OFFICE - NIGHT
HARRY'S FACE PLUNGING INTO WATER, BREAKING THE SURFACE...
87 INT. SLUGHORN'S OFFICE/YEARS PAST - NIGHT
We emerge from the CRACKLING EMBERS of a FIREPLACE. A much
younger--and more smartly dressed--Slughorn probes a dish
of CRYSTALLIZED PINEAPPLE as he holds court before 16-YEAR-
OLD TOM RIDDLE and five other BOYS. The CRYSTAL HOURGLASS
sits on a side table.
Sir, is it true that Professor Merrythought is retiring?
Slughorn chuckles, wags a sugar-encrusted finger at Riddle.
Now, Tom, I couldn't tell you if
I knew, could I? I must say,
m'boy, I'd like to know where you
get your information. More
knowledgeable than half the staff,
(as the other boys laugh)
By the way, thank you for the
pineapple--you're quite right, it
is my favourite--how is it you
Riddle smiles but his expression suggests intuition had
nothing to do with it. Slughorn chuckles uneasily.
Good gracious, look at the time.
Off you go, boys, or Professor
Dippett will have us all in
detention. Lestrange, Avery,
don't forget your essays...
As the others file out, Slughorn busies himself with some
he turns, finds Riddle still there,
standing by the crystal hourglass.
Look sharp, Tom. You don't want
to be caught out of bed after
I know a secret shortcut or two.
Yes, I imagine you do. Something
on your mind, Tom?
Yes sir. I couldn't think of
anyone else to go to. The other
Professors, well, they're not
like you. They
Riddle slips off the RING on his left hand, begins to roll
it between his fingers. It is set with a BLACK STONE.
I was in the library the other
night, in the Restricted section,
and I read something rather odd,
about a bit of rare magic, and I
thought perhaps you could
Suddenly a DENSE FOG engulfs the room and SLUGHORN'S VOICE
twists into an ANGRY SHRIEK:
I don't know anything about such
things and I wouldn't tell you if
I did! Now get out of here at
once and don't ever let me catch
you mentioning it again!
The FOG grows thicker and...
88 INT. DUMBLEDORE'S OFFICE - NIGHT
...CAMERA emerges from the swirling Pensieve. Harry blinks,
finds Dumbledore studying him from across the room.
Confused? I would be surprised if
Two pictures show young Riddle and young Slughorn from this scene.
The Japanese TV Trailer from January shows Harry and Dumbledore during this lesson.
A previously released picture as well as another shot from the third trailer shows Dumbledore in thought.
Rachezee discussed Harry and Dumbledore’s relationship in the film.
There are a lot of one liners and subtleties that we have never seen before between DD and Harry in this film. They are very effective at showing a comfort and friendship between the two. At one point DD delicately asks Harry about his relationship with hermione. Harry makes it clear they are just best friends.
A picture emerged of Harry and Ron, hiding from Professor Slughorn according to the blurb. Rachezee states that this is an attempt of Harry’s at gaining the memory.
This scene was featured in the Japanese TV trailer, where Harry asks Slughorn what Voldemort was like as a student.