Rei is dragged along too, but Shinji struggles desperately to step forward and keep his balance
Reichu: I find Shinji's reaction here to be quite amusingly drawn. Especially this part.
UrsusArctos: In the second-last image it looks like Rei was about to cuff Shinji before he fell on her.
EvangelionFan: It's a shame Puchi Eva didn't parody this scene.
NemZ: I’ve watched this several times and the mechanics of how he slips backwards but ends up falling forwards still makes no sense to me. I might as well be watching the JFK Zapruder tape.
Fireball: C'mon man, it's freaking Rei standing infront of him. Naked and wet!! You would lose balance too!
Xard: Editing through this whole scene is marvelous but I'd like to give a shout out to the way cuts are spliced together through 202-209, something even platinum booklet noted:
"The eccentric way the cuts were split up when Shinji visits Rei's apartment was also memorable."