[NitpickLawyer]

I think they mean the boat is moving. In the flash ones the paddles are animated but the boat is stationary for me.

[codazoda]

The boat moves in all three for me

[Fishkins]

The boat itself rocks, but do you see the background changing to indicate the boat is progressing through the environment? I only see that in the 3.1 Pro example. I believe that's what the OP meant.

[Manuel_D]

I think this illustrates the problem with OP's prompt. If the goal is specifically to implement a scrolling background, this should have been in the prompt.

[SXX]

Yup. My bad. It was just first idea that come to my mind since I enjoy visually compare each new release with unique prompts.