I've got one.
Page 116, under the header Hitchhiker Damage the book makes reference to an echo called "Resonance Hitchhiker", supposedly on page 258 of SR5.
EDIT: I realize this must mean "Resonance [Program]" taken for Hitchiker. This is pretty unclear...
Also, minor grammatical error: Page 117, Minor and Severe Variances; "When you make a minor variance, the Foundation makes a Variance Test. The threshold for a Variance Test is always 4. On a minor variance, the dice pool is only the host's Firewall rating. On a severe variance, the dice pool is Rating + Firewall." This section should instead begin with "When you make a variance,"
Also, they don't explain how often you would do such a roll. I ask because, many of the examples of variances are not doing a thing. Would you simply get one roll when you first entered (or when you stopped doing a thing)? Would it be every combat turn? Every pass or action you take that isn't that thing? For these variances, imagine the book's example of "a dark plain where everyone is bleeding" and assume the players, for whatever reason, are not catching on that they need to look like they are bleeding constantly. How often would this trigger a Variance Test?