The podcast episodes provided discuss various aspects of investment returns, including how to estimate future returns for retirement planning, the performance and challenges of private equity funds and robo-advisors, as well as the exceptional returns achieved by the Renaissance Technologies hedge fund.

For example, episode "How to Estimate Future Returns When Planning Your Retirement (Get this Right!)" focuses on incorporating reasonable return assumptions into retirement calculations, while episode "Investors Find Trouble with Private Equity Funds - 6 Key Points 6-18-24" delves into the expected returns from private equity compared to public markets.

Episode "Q&A: Stuck in a Real Estate Investment, 3X Leverage ETFs, & HELOCs to Invest" also discusses the importance of return assumptions, and episode "Episode 309 - Are Robo-Advisors Passive Investors?" compares the performance of different robo-advisor platforms.

Finally, the "Renaissance Technologies" episode provides a captivating look at the extremely high returns generated by this quantitative hedge fund over decades.