The short version
Most overspend on motion projects is planned in, not caused by bad execution.
What is really going on
Unplanned deliverable lists produce duplicate builds of the same asset.
Render strategy decided late leads to full re-renders for small notes.
Uncapped revisions consume the margin that would have paid for better craft.
How to handle it
Write the complete deliverable list, including every crop and duration, before quoting.
Decide the render layer strategy before animation, not after the first note.
Cap revisions and price additional rounds transparently.
The takeaway
Planning is not overhead. It is the discount you give yourself before production starts.
