Technical but interesting: Designer Iginio Lardani’s title sequence for The Good, the Bad and the Ugly contains only one error, and it’s in Lardani’s own credit (2:33 above).
“[A]n ‘error’ specific to optical printing caused by improper loading of the footage and mask being composited — Newton’s rings — appears in his title card alongside the text stating ‘TITLES | LARDANI,” notes film historian Michael Betancourt in Semiotics and Title Sequences (2017).
This appears to be an inside joke meant for other title designers. According to his son, Lardani had complete freedom in creating the design. Betancourt writes, “Recognizing this specific ‘error’ in the card stating ‘TITLES LARDANI’ depends on technical knowledge of the optical printing process. … given the technical perfection in the rest of the sequence, it is not just a ‘beginner’s mistake,’ but implies a conscious choice to include this compositing error in the design.”
“It is a joke only comprehensible (even recognizable) by an audience that recognizes the Newton’s rings and understands what they are — an error in the optical printing; this knowledgeable audience specifically includes title sequence designers rather than the general public. … Because it is specifically a specialized, technical mistake, its recognition will be severely limited to his peers — suggesting that they are the ones being addressed by it.”