Recent measurements by the ATLAS experiment are sensitive to the underlying event, the hadronic activity observed in relationship with the hard scattering in the event. Underlying event observables like the average particle multiplicity and the transverse momentum sum are measured for Kaons as Lambda baryons as a function of the leading track-jet and are compared to MC predictions which in general fail to describe the data. Furthermore, an analysis of the momentum differences between charged hadrons in proton-proton, proton-lead, and lead-lead collisions was conducted. The difference in the yield of hadron pairs with like-sign and opposite-sign charges is used to extract the spectra of pairs adjacent in color flow with the measurement being sensitive to the dynamics of hadronization.