RFID chips in the postcard and perfume. Cheap and effective.
The board Howie wrote on is a type of tablet that transmits what he wrote.
The remote control was BS of course.
The video was definitely edited in real time, or moments before. A white roof would be an easy backdrop for some alpha blended characters to be added as in Photoshop.
I noticed also that all of the letter "A"s look pretty similar, as if written by someone, not painted in huge letters from ground level. Left line on the A is shorter than the other, and the cross line goes way past the line on the right. On all of them.
Also notice that the curved lines on the letters are very smooth and perfect. Ever try doing that with huge letters on a rooftop? Ever see a picket sign with large handpainted letters that are nice like that?
It is the letters themselves that give it away. They look too good, too straight. Looks exactly like Photoshop. It is.
Finally, notice that the person on the roof isn't painting one of the letters, it is a heart which is likely there in every scenario. It sells the illusion, or tries to.
What's up with the dude playing the piano. Is he the person transmitting the info?
That's my guess. That's how I'd do it and it would work.
