We address some nuclear effects, collective (long range) RPA
correlations and 2p2h mechanisms (absorption of the weak gauge boson by a pair of interacting nucleons), on charged-current
neutrino-nucleus reactions that do not produce a pion in the final
state. We discuss results from a microscopical model, that includes these corrections, for MiniBooNE muon neutrino and antineutrino CCQE-like $d\sigma/dT_\mu d\cos\theta_\mu$ data. We also argue that the algorithm used to reconstruct the neutrino energy is not adequate
when dealing with quasielastic-like events, and analyze the
MiniBooNE neutrino CCQE unfolded cross section. We find that this cross section exhibits an excess (deficit) of low (high) energy neutrinos, which is an artifact of the unfolding process that ignores 2p2h mechanisms.