How can I place a footnote in my reference?

I think that we can use the note field in bibliography for footnote.

---

\documentclass{article}

\pagenumbering{gobble}

\usepackage{filecontents}

\begin{filecontents*}{mybib.bib}
  @Article{art2017,
    author =     {John Doe and Jane Doe},
    title =      {Paper Title with Typo},
    journal =    {Journal Name},
    year =   {2017},
    note =   {\footnote{There is a typo in the paper title.}}}
\end{filecontents*}

\usepackage[american]{babel}
\usepackage{csquotes}

\usepackage[backend=biber,style=apa]{biblatex}

\DeclareLanguageMapping{american}{american-apa}

\addbibresource{mybib.bib}

\usepackage{lipsum}

\begin{document}

\lipsum[1-2]

\bigskip

We really need to cite this~\cite{art2017}.

\bigskip

\lipsum[3-4]

\printbibliography

\end{document}

---

You can use the \mkbibfootnote macro in the title field of your bib entry.

\documentclass{article}
\usepackage[american]{babel}
\usepackage{csquotes}
\usepackage[style=apa]{biblatex}
\DeclareLanguageMapping{american}{american-apa}
\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@article{Linn1968,
  author = {Linn, L.},
  date = {1968},
  title = {Social identification and the seeking of pyschiatric\mkbibfootnote{The published article includes this typo.} care.},
  journaltitle = {American Journal of Orthopsychiatry},
  volume = {38},
  pages = {83-88},
  doi = {10.1111/j.1939-0025.1968.tb00558.x}
}
\end{filecontents}
\addbibresource{\jobname.bib}
\pagestyle{empty}
\begin{document}
\null\vfill
\nocite{*}
\printbibliography
\end{document}