The regression lecture is using unescaped latex in a name. This seems to work in the html renderer, but not in the katex one used in vscode jupyter notebooks.
That is,
$$
\log(\text{price}) = \beta_0 + \beta_1 \text{sqft_living} + \epsilon
$$
is incorrect and should be
$$
\log(\text{price}) = \beta_0 + \beta_1 \text{sqft\_living} + \epsilon
$$
or something similar.
We should look to see if there are other locations that could have this issue.