  This paper describes two distinct effects observed during the operation of
the LHC in 2012: first, the impacts on beam parameter evolution of the
end-of-squeeze instabilities encountered in the second half of the 2012 run;
and, second, the very reproducible loss pattern of Beam 1 observed (while a
similar pattern was negligible, if present at all, for Beam 2). Statistics for
2012 are provided and the impact on luminosity production is highlighted.
