The following typos are for the book
A. Colin Cameron and Pravin K. Trivedi, Regression Analysis of Count Data
Econometric Society Monograph No.30, Cambridge University Press, 1998.

This list is very incomplete:

p.10 line 15  Sum-j x_jibeta_j  not  Sum-j x_jibeta_i

A. Colin Cameron   University of California - Davis