Every byte of the cartridge is accounted for and the listing reassembles into the exact ROM. What follows is what is explained but not fully understood, and what has not been watched happen.
It is established that nothing points at it: the word does not appear in the ROM in either byte order. What is not established is why it is there. A pose that was cut? A first draft of a layer that ended up drawn differently? It sits between two patterns that are used, so it is not tail-end filler.
0x4272 asking for 22 bytes where there are 16 looks like a slip, and the six that leak through are harmless because the patterns they point at are empty. But "harmless" was checked on the dumps at hand: sprites 15 and 16 hold that rubbish and nothing is seen. Whether some combination of patterns loaded later could make them show has not been ruled out.
Both are read and both are explained by who reads them — 0x753B copies the first eight to the ball's variables when a point starts, and 0x5492 indexes the second by the class of shot. What each individual value means in the ball's physics is not pinned down one by one.
They are the shot's effect table, four bytes per class, and 0x69B0 copies them into 0xE0AA spaced two apart. The four are used as force, spin and two corrections, but which is which has been deduced from how they are consumed, not proved on the screen.
The doubles code is fully traced — the pairs swap sides (0x6D12), share out the net and baseline roles (0x6E09) and keep from getting in each other's way (0x6CF7). It has not been played through: the demo only ever plays singles.
The 25 tunes at 0x7C69 are decoded and the format is known byte by byte. Which tune is which in the game has only been matched for the ones the demo plays.
The cartridge does not carry Konami's hidden mark, and that was checked over all 16,384 positions with a finder validated against cartridges that do carry it. The ROM runs full of code and data to 0x7FE8 with 23 bytes of filler left, which is a plausible reason — but it is a reason, not a proof of intent.