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In Adventure #1, when can I cross off my circled System Errors, and can rockets overflow?
The designer answered this directly on BGG. It matches the rulebook.
Only after every line of the rocket track has been crossed off, bottom to top. Rockets from an Active Rocket effect first fill the lines (surplus overflows into the next line), then each leftover rocket cancels one circled error (a 4-rocket cancels four). Rockets still left after that go to the tiebreaker rockets. The rulebook's line-by-line wording and the old example picture predate this clarification, which the designers confirmed repeatedly.