I think it's a pretty good assumption that the effect was intentional, if the two heads are made to be visible in different angles of light, rather than random line segments across the whole image.
They don't have actual video of the effect (probably almost impossible for an amateur to capture), just an animated description, so that may not actually be the case.
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_______________| We live in the nick of times.
| Len 17, Wid 3 |
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[pics]