Oracle relative to which $\mathsf{BPP}$ is not contained in $Δ_2 \mathsf{P}$
The oracle goes back to Stockmeyer in 1983. Heller gave the stronger result that : $BPP = EXP^{NP}$ in a relativized world in 1986. Karpiniski and Verbeek (mentioned in the comments) reprove Heller's result.