  Recent reports of superconductivity in the vicinity of room temperature have
been the subject of discussion by the community. Specifically, features in the
resistance-temperature (R-T) relations have raised questions. We show that many
of these features can arise from previously unaccounted-for dynamic effects
associated with the AC transport techniques often used in high-pressure
experiments. These dynamic AC effects can can cause the apparent resistance
(Rapparent) to diverge from the DC resistance (RDC), sharpen measured
superconducting transitions, and produce other features in the measured R-T
response. We also show that utilizing the full output of phase-sensitive
transport measurements provides a valuable probe of superconducting samples in
difficult to measure systems
