The twin brother angle, taking revenge.
Post Dhoom 3, they couldn't really re-work their script. They took Thimiru/Padayappa's vamp character & wove a story around it. If Prabhu had simply remade Thimiru as it is then it might have worked. But he tried to force it into the twin angle & then the whole second half of twins exchanging to fool the villain was taken straight up from two dozen Telugu films. He just couldn't get it to work.
What do you think went wrong with Action Jackson ?
When we started Action Jackson, I knew the film wouldn’t work. I don’t blame Prabhu Deva for that. Our bad luck was that after we had put up the set and were about to begin shooting, we realised the story was similar to Dhoom 3. Prabhu tried his best to revamp the script, but we still went ahead with it as the producers were incurring losses. It was an emotional decision, but I wouldn’t want any producer to face such losses.