I'm a bit late to the party, but I've just finished reading the Singularity Sourcebook and have come here to report little typos and mistakes I've found while doing so. It's possible (likely, even) that many if not all of these have been pointed out before; if they have, I apologise.
As per usual, entries with [?] appended are ones I'm not sure if there's actually been a mistake.
Page 4, 'Campaign Summary', 1st Paragraph: "The first act is called Sylean Dream, in which the Travellers are introduced to Naalir the alien conscious intelligence that is central to the campaign." - Missing comma between 'Naalir' and 'the alien conscious intelligence'.
Page 10, 'Artificial intelligence in the Third Imperium': Missing formatting, as I assume this was meant to be a section heading (Bold, Point 22 under the standard Mongoose manuscript formatting).
Page 22, 4th Paragraph: "(...) dating as far back as the early Arbilatran Era (...)" - This should read Arbelatran, after Empress Abrellatra, not 'Arbilatran'.
Page 30, Deck Plans, Deck 3: Extra curved wall segment by biosphere (item 11) blocking access to airlock.
Page 38, Deck Plans: The floor hatch on Deck 2 needs to be moved one square to the right, so it properly lines up with the ceiling hatch of the Fuel and Expedition Modules.
Page 46: Review the rules for Luxury passengers as there are currently some oddities in the DMs and in the formatting. - I believe these might have been previously addressed.
Page 54, 'How It Works', 3rd Paragraph: There are rogue extra parentheses and period in the text following 'but it is not standard operating procedure.".'
[?] Page 87, 1st & 2nd Paragraphs: I have had trouble fully understanding how reintegrations wherein the embodiment has taken damage is meant to work, and do think either a worked example or clearer phrasing might be required.
[?] Page 94, 'How to Referee The Sim', 2nd Paragraph: "Sim in this campaign are described in the Sim Types table." - Missing plural in the first 'Sim', where it should be Sims(?).
Page 96, 'Active Participant', 1st Paragraph: "They can establish private connections with other agents intercept communications from opposed agents, and affect their programming if equipped with the appropriate software." - Missing comma between 'other agents' and 'intercept communications'.