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Observations of linear magnetoresistance has a near 100-year history with origins ranging from effects of open Fermi surface in polycrystalline metals, pushing materials like bismuth to the quantum limit, to large scale inhomogeneity/defect clusters in silver chalcogenides—such diversity has long given rise to controversy. This talk will focus on the surprising observation of a large non-saturating linear magnetoresistance that appears in ultraclean, molecular beam epitaxy-grown thin films of the correlated metal SrVO₃. The unusual nature of this observation is that the linear magnetoresistance appears only when the samples are in the ultraclean limit and sets in far below the quantum limit; this strongly implies that this is an intrinsic feature of the electronic structure. As such both intrinsic effects, coming from the Fermi surface geometry and electron-electron correlations, and extrinsic effects, particularly defect structures common to perovskites, will be discussed.