The scope of this public note is to present preliminary measurements of MeV energy signatures and relevant backgrounds for beam neutrino interactions using a dedicated reconstruction technique, expanding upon the original study by ArgoNeuT. We also use this technique to identify and quantitatively analyze the low energy activity emanating from the field cage support ribs in the MicroBooNE detector and discuss how the usage of similar construction materials could be a source of background for low energy physics analyses in future neutrino detectors such as the Deep Underground Neutrino Experiment (DUNE). We also highlight the application of the low energy reconstruction technique to studies of neutrino interactions from core-collapse supernovae and muons decaying at rest (µDAR).