$53A4 is (very near to) the start of the attract mode cycle.
$54AA is at the very end of the attract mode cycle (it jumps back to $53A4) but there are only 3 bytes available.

$4072 is immediately after it detects a keypress (space only!)
And $4065 is the code that detects the keypress in case we want to expand it to any key.

$54AA: 4CAA53 -> 4C0001
$4068: C9A0F006A9008D10C0 -> 10034C0001EAEAA900