Joint-Embedding Predictive Architectures (JEPA) are a promising framework for self-supervised video representation learning, yet the behavior of auxiliary objectives in small-scale Video-JEPA training is not well characterized. We report a small-scale empirical study of 18 auxiliary objective variants for Video-JEPA across two pretraining regimes: single-dataset (UCF-101) and mixed-dataset (UCF-101 + Something-Something V2 + ImageNet-100). We evaluate frozen representations on three complementary benchmarks: Diving-48 (fine-grained motion), SomethingSomething V2 (temporal reasoning), and ImageResearch goal: What is the impact of mixed-dataset pretraining with factorized latent dynamics objectives on the robustness of Video-JEPA representations against temporal perturbations in the Something-Something V2 benchmark?Autonomous synthesis report generated by Assignee Research. Tribunal consensus score: 8.5/10.