The following is a brief summary of some of the thoughts said over by R' Frand on the parsha. I have attempted to reproduce these vorts to the best of my ability. Any perceived inconsistency is the result of my efforts to transcribe the shiur and should not be attributed to R' Frand.
R' Frand began the vort with a famous question and a suggested answer by R' Yaakov Kaminetsky. The Torah writes that Moshe changed Yehoshua's name and all of the meforshim ask, why was Moshe only concerned about Yehoshua?
R' Frand answered the question by making reference to the order of the listing of the meraglim. The Ramban notes that they are not listed by age or based on how they marched and asks - why were they listed in this order? The Ramban answers that they were listed based on their personal level of honor. However this would imply that other meraglim were more important than Yehoshua and Kalev, but they are never heard from again!
R' Frand next quoted the Rashi who said that Moshe saw that the younger people in the shevatim were pushing away the older ones. Moshe then used a parental expression - "this is not going to end well." So Moshe was then inspired to say that Hashem will save you (Yehoshua) from the meraglim's plan. There was no need to say that when Kalev was mentioned because they had not started pushing yet.
R' Yaakov also explains that Kalev did not need a beracha because he was married to Miriam and when a person is married to a tzadekes he has an anchor. Moshe was thus sure that Kalev would not get carried away, but Yehoshua did not have a wife and for that reason Moshe was concerned about him.
R' Frand also mentioned a question from R' Yaakov who noted that the people who died because of the meraglim were people who were between 20 and 60. Does that mean that no one over 60 followed the meraglim? R' Yaakov answered that no one over 60 believed the meraglim because they were not going to fight to conquer the land. The people who were going to fight were not looking objectively because they were concerned about surviving the battles. However the people over 60 had no agenda so they could hear the meraglim's message and decide for themselves that the message was wrong. Whereas, those people who were going to fight were biased and could not fairly consider the statements of the meraglim.
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