While brute force will eventually work, there's a logic and a theme to it.
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Honestly trying to find the giveaway code looks like too much of a hassle to me, so have a free bump :P
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I recognize them too, but the letters won't work?!
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"Nice to meet you! Do you know your A-B-Cs?"
"A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z"
"Terrific! You do indeed. Now, instead of telling you what I think, I'll do something better, I'll invite you to The Alphabet Train! 26 wagons, one for each letter of the alphabet! You need to be Level 3 or more to board it, and you can get on it until next Sunday 10th of May, at 10AM UTC."
(...)
"Oh, right, I'm sorry, here's the ticket."
This train and puzzle are over! Nothing to see here!
(except the solution below if you're curious)
The train ticket included 5 images, so first of all you needed to figure out that each one corresponded to an alphanumeric character, and combining them all together you'd obtain the relevant part of the URL to the first wagon of the train.
Now, I said several times in the discussion that there was some common theme to what you needed to "extract" from each image. And, this being The Alphabet Train it kind of made sense to be something related to the alphabet. Or, maybe, AN alphabet?
Indeed, the thing in question was the NATO phonetic alphabet, and each image corresponded to an element in this alphabet:
1: Victor Vran ---> Victor ---> v
2: A couple tango dancing ---> Tango ---> t
3: Charlie Sheen ---> Charlie ---> C
4: Juliette Lewis ---> Juliet ---> j
5: Sub-Zero ---> Zero ---> 0
All together: vtCj0, which gives us the URL of the first wagon of the train.
The relative sizes of the images was a clue of whether they were upper-case or lower-case. I also made Sub-Zero taller than lower-case but shorter than upper-case in order to indicate that he represented neither, but a number. Anyway, "Sub" doesn't belong to the NATO alphabet, so it was the "Zero" part what we wanted.
Finally, a couple of hours after the puzzle began, I edited the OP so the first letter of each paragraph spelled N-A-T-O, but I'm not sure anybody noticed it :P
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