Another couple of trivial ones - the red dot cursor or sight disappears when the big rover is driven on to the large crusher.
The "hand" icon appears when you manage to find a button, but there is no indication of where the target point is, otherwise.
When dismantling buildings with the grinder, the circular scale vanishes if you move more than a certain distance along the side of the building & re-appears when you move nearer the start point.
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